Propeller



Aug. 6, 1935. w. i-l. LEI-NWEBER FROPELLER Fil ed Jan. 21, 1953 5mvENTbiz. William H. Leinweber HIS ATTORNEYS Patented Aug. 6, 1935rnoPELLEB k g William H. Leinweber, Chicago, Ill. Application January21, 1933, Serial No. 652,829 v 1 Claim. This invention relates to apropeller.

It is an object of this invention to provide an improved propeller whichis relatively simple and inexpensive in construction and efiicient inuse.

Other objects will. appear hereinafter.

The invention consists in the novel comblnation and arrangement of partsto be' hereinafter describedand claimed. The invention will be bestunderstood by reference to the accompanying. drawing, showing thepreferred cm of construction and in which:

Fig. l is a perspective view of a preferred embodiin'ent of theinvention;

Fig. 2 is a sectional view on line {-2 in Fig. 1;

Fig. 3 is an elevational view of the same; and- Fig. 4 is a top planview thereof. The new propeller comprises a hub l and blades 2 and 3extending radially therefrom.

Formed integrally with, or converted in any suitable manner tendingtransversely thereacross, is a series of fins 4. These fins 4 are curvedthroughout their extent and they have a convex curvature ln'thedirection of the hub I, or'a concave curvature in the direction of theradially outer ends .or tips of the blades '(Figs. 3 and 4); the heightof the fins 4 increasing gradually from the leading edges 5 of theblades to the trailing edges 8 thereof.

The present propeller is especially designed for use as a ventilatingfan and when in use improves to, each of the blades, and exgenerally thecirculation of the air 'in which it operates, one reason for this beingthat the construction of the fins 4 directs the air therefrom toward theradially, outer ends or tips of the blades.

' While I have illustrated and described the preferred form ofconstruction for carrying my invention into efiect, this is capable ofvariation and modification, without departing from the spirit of theinvention. I,- therefore, do not wish to be limited to theprecisedetails of construc-. tion set forth, but desire to avail myselfof such variations and modifications as come within the scope of theappended claim. a Having thus described my inventionwhat I claim as newand desire to secure by Letters Patent, is:

A propeller including a blade having a series of fins extendingtransversely thereacross between the leading and trailing edges thereof;said blade having a substantially uniform and fiat surface throughoutits main extent on the side thereof on which the said fins are arranged;each of said fins being curved throughout its extent and having aconcave curvature in a direction toward the radial tip of the blade;said fins gradually increasing in height from the leading edge of theblade to the trailing edge thereof.

WILLIAM: H. LEINWEBERI

